The Tboli people ('tʔbɔli) are an Austronesian ethnic group native to South Cotabato in southern Mindanao in the Philippines. Tbolis currently reside on the mountain slopes on either side of the upper Alah Valley and the coastal area of Maitum, Maasim and Kiamba in the province of Sarangani. In former times, the Tbolis also resided in the upper floor of the Alah Valley. After World War II and the arrival of settlers from other parts of the Philippines, they have been gradually pushed to the mountain slopes. As of now, they have almost been expelled from the fertile valley floor. Like their immediate neighbouring ethnic groups, the Úbûs, Blàan, Blit, Tàú-Segél, and the Tasaday, they have historically been described as pagans, animists, etc., as opposed to Muslim peoples or Christian settlers. In political contexts, however, the Cebuano term "Lumad" ("native") has become an umbrella term for the various polytheistic peoples of Mindanao. In ethnographic and linguistic literature on Mindanao, their name is variously spelt Tboli, T'boli, Tböli, Tagabili, Tagabilil, Tagabulul and Tau Bilil. Their endonym is Tboli. Their whereabouts and identity are somewhat imprecise in the literature; some publications present the Tboli and the Tagabili as distinct peoples; some locate the Tbolis in the vicinity of Lake Buluan in the Cotabato Basin or in Agusan del Norte. They are considered to be an indigenous people in Philippine law. Music of the Philippines and Agung The Tboli have a musical heritage consisting of various types of agung ensembles – ensembles composed of large hanging, suspended or held, bossed/knobbed gongs that act as drone without any accompanying melodic instrument. Other instruments include the hegelung. List of Philippine mythological figures The T'boli have a highly complex and unique religion composed of the life ways and belief systems inherent to their psyche. However, in modern times, their religion has been degraded to an extent due to the influence of Catholicism, Protestantism, and Islam.